On 05/15/2019 05:45 PM, Glen I Langston wrote:
Hi Marcus,
That’s great. What could you hear/detect with the 90 kHz bandwidth?
Glen
I used it strictly for SIDs in the VLF band up to 40kHz or so...
I had a loop antenna, about 1.2m diameter, and about 10 windings of
#20ga wire. No tuning capa
Hi Marcus,
That’s great. What could you hear/detect with the 90 kHz bandwidth?
Glen
> On May 15, 2019, at 5:28 PM, Marcus D. Leech wrote:
>
> On 05/15/2019 03:23 PM, Brad Hein wrote:
>> Great suggestion thank you! This also gives me new topics to read up on as I
>> am still a VLF amateur.
>
On 05/15/2019 03:23 PM, Brad Hein wrote:
Great suggestion thank you! This also gives me new topics to read up
on as I am still a VLF amateur.
[Sent from mobile device]
I used a Berhringer "mini-MIC" microphone amplifier, which has a
balanced, XLR, input, and has bandwidth out to
about 90kHz.
Great suggestion thank you! This also gives me new topics to read up on as
I am still a VLF amateur.
[Sent from mobile device]
On Wed, May 15, 2019, 1:20 PM John Coppens On Thu, 2 May 2019 16:22:24 -0400
> Brad Hein wrote:
>
> > I took a Raspberry Pi and attached a 48KHz USB sound card, with a
On Thu, 2 May 2019 16:22:24 -0400
Brad Hein wrote:
> I took a Raspberry Pi and attached a 48KHz USB sound card, with a big
> magnetic loop antenna fed into the mic.
Just a suggestion: If you have a loop antenna, which is a symmetrical antenna,
and couple it to an asymmetrical input (MIC), you wi
On 05/08/2019 08:33 AM, Brad Hein wrote:
As an avid fan of Raspberry Pi, often putting them to use for DSP
applications, I just want to say thank you for your hard work keeping
gnuradio working and optimized on the platform!
I've seen some great FET preamp circuits available on the internet, a
Thanks for the support!
Regarding your VLF experiments there's an historically interesting VLF
transmitter Grimeton SAQ sometimes active on 17.2kHz.
https://alexander.n.se/the-radio-station-saq-grimeton/saq-transmissions/?lang=en
--Albin
On Wed, May 8, 2019 at 2:34 PM Brad Hein wrote:
>
> As a
As an avid fan of Raspberry Pi, often putting them to use for DSP
applications, I just want to say thank you for your hard work keeping
gnuradio working and optimized on the platform!
I've seen some great FET preamp circuits available on the internet, a few
of which I've tried out. I'll dust one o
Hi Brad,
Just some random ideas... What you are trying to do is very doable. Ive
seen a lot of people do it for VLF reception... Usually along with some
kind of FET amplifier before the mic...
The frequency xlating FIR filter doesn't have great performance on the rbpi
at the moment.
The frequency
On Tue, May 7, 2019 at 4:19 PM Marcus D. Leech
wrote:
> On 05/07/2019 04:05 PM, Ben Hilburn wrote:
>
> Hey Brad - just checking in! This is an interesting experiment, and I
> would love to hear how it went!
>
> Big thanks to Kevin and JMF for providing very helpful guidance, here, too
> =)
>
> Ch
On 05/07/2019 04:05 PM, Ben Hilburn wrote:
Hey Brad - just checking in! This is an interesting experiment, and I
would love to hear how it went!
Big thanks to Kevin and JMF for providing very helpful guidance, here,
too =)
Cheers,
Ben
I should perhaps have entered this discussion earlier, an
Yes I am very eager and hankful for the suggestions. Trying to make time to
build out the flow graph and give it a go. Hopefully tonight!
[Sent from mobile device]
On Tue, May 7, 2019, 4:06 PM Ben Hilburn Hey Brad - just checking in! This is an interesting experiment, and I
> would love to hear
Hey Brad - just checking in! This is an interesting experiment, and I would
love to hear how it went!
Big thanks to Kevin and JMF for providing very helpful guidance, here, too
=)
Cheers,
Ben
On Thu, May 2, 2019 at 7:12 PM Kevin Reid wrote:
> On Thu, May 2, 2019 at 1:22 PM Brad Hein wrote:
>
On Thu, May 2, 2019 at 1:22 PM Brad Hein wrote:
> I took a Raspberry Pi and attached a 48KHz USB sound card, with a big
> magnetic loop antenna fed into the mic. A little cheesy? yes! But I'd like
> to try and see if I can receive VLF. It's in a remote location with little
> to no interference so
reading your email more closely:
* the sound card generates real data with an even spectrum with components at w
and -w
* you transfer from VLF band to baseband by multiplying by a complex NCO
exp(-jwt) with t=[0:length(samples)]/fs
when sampling at fs
* the -w component is shifted to -2w that yo
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017RS006420
or
http://jmfriedt.free.fr/agu_dcf77.pdf
We are currently working on simultaneously decoding (e)LORAN/MSF, TDF & DCF77
v.s GPS
with a sound card.
JM
--
JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe,
25000 B
I took a Raspberry Pi and attached a 48KHz USB sound card, with a big
magnetic loop antenna fed into the mic. A little cheesy? yes! But I'd like
to try and see if I can receive VLF. It's in a remote location with little
to no interference so I'm thinking my chances should be good. The challenge
I'm
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